[Bug 49747] dpms on only works on DP0 on a hd5700

[bugzilla-daemon@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=49747

--- Comment #12 from Daniel Vetter <daniel@ffwll.ch> 2012-05-10 13:39:27 PDT ---
Ok, more throughrough testing on all ports. The screens are both the same
model, but different manufacturing dates (and firmware revision according to
osd).

DP0 seems to work in all cases, although when I switch off the screeen or
unplug the cable, I need to do a vt switch to get a picture on the screen.

DP1-4 seem to work with the hdmi cable for a dpms off/on cycle, but not with
the dp cable.

DP1-4 doesn't work at all (either hdmi or dp) when the monitor got switched off
or the cable freshly plugged in while linux is running. Even xrandr
--off/--auto doesn't help, only rebooting.

The entire thing seems pretty flaky, even switching the input selection on the
screen between hdmi and dp is enough to loose the dp signal. With this round of
playing I've also seen new noise in dmesg:

[ 1275.106268] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid,
remainder is 44
[ 1275.106271] Raw EDID:
[ 1275.106272]          00 ff ff ff ff ff ff 00 22 f0 f9 26 01 01 01 01
[ 1275.106274]          0b 13 01 04 a5 36 23 78 ee ce 50 a3 54 4c 99 26
[ 1275.106275]          77 0f 50 54 a5 6b 80 81 40 a9 00 a9 40 b3 00 d1
[ 1275.106276]          00 01 01 01 01 01 01 28 3c 80 a0 70 b0 23 40 30
[ 1275.106277]          20 36 00 22 60 21 00 00 1a 77 00 00 fc 00 48 50
[ 1275.106278]          20 4c 50 32 34 37 35 77 0a 20 20 00 00 00 fd 00
[ 1275.106279]          30 55 1e 5e 15 04 11 50 d2 f8 58 f0 00 00 00 00
[ 1275.106280]          ff 00 43 5a 43 39 31 31 30 30 39 34 0a 20 20 00

and similar corrupted EDIDs. xrandr always displayed the correct modelist
though, afact. I'll do the radeontool dump now.

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